Steam
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Steam, Valve Software's digital distribution service for PC games, is not directly provided in the Alpine or postmarketOS repositories, but it can be used on postmarketOS with some workarounds.
As Steam is only available for x86/x86_64 processors, an emulation layer must be used to get it working on arm64 platforms. While Steam may be installed directly (via Flatpak or otherwise) on x86_64 installations of postmarketOS, the majority of postmarketOS devices use the ARM architecture.
There are two candidates for the emulation layer used to run Steam on arm64 - box86/box64 and FEX-Emu. I have created guides for setting up both of them inside Distrobox containers.